Combined drill and deburring tool



Mmfln K6 wi D. JONES COMBINED DRILL AND DEBURRING TOOL Filed Oct. 30, 1944 INVENTOR DEDGER JONES Patented Mar. 16,1948 2,437,822

UNITED STATES PATENT OFFICE 2,437,822 COMBINED DRILL AND DEBURRING TOOL Dodger Jones, Columbus, Ohio, assignor to Curtiss-Wright Corporation, a corporation of Delaware Application October 30, 1944, Serial No. 560,938

Claims. (01. 77-66) This invention pertains to hand or machine The drill shank immediately to the rear of the operated tools and particularly to a novel defluted portion is formed with a central longiburring tool. tudinal slot-like recess l3 which is fully open at One of the principal objects of the present the lower side but has a limited opening at the invention is found in the improvement which con- 5 upper side which is sufficient to permit the outsists in combining with a rotary cutting tool, ward projection of a cutting or deburring blade such as an ordinary drill bit, a supplementary element M. The deburring blade element I4 is cutting blade which is efiective for removing the movably positioned and retained in this slot upon sharp burrs raised by the drill bit when the latter a resilient arm 15, the base of the resilient arm enters the work; or When drilling a through hole being welded or otherwise securely anchored. on or aperture, is effective for removing the burrs the end wall l6 of the slot, as at ll. Thus the formed at the hole margins on the face and back blade member M can be depressed or moved sides of the work. radially inwardly oi the slot l3 so that no por- It is also an important object that the suppletion thereof projects beyond the cylindrical surmentary or deburring cutting blade perform its face of the shank l2. On the other hand the intended function efficiently, entirely automatblade I4 is definitely limited in its effective outically and in the course of the drilling operation. ward movement by the arm 15 contacting the Still another advantage assignable to this inportion l3a. of the recess l3.

vention resides in the form and mounting of the The deburring blade element is n he e deburring blade whereby it may pass through the eral form of a trapezium, the longer one of the aperture or drilled hole, and in so doing remove Parallel s e c st t t the see d e the burrs formed during the drilling operation face of the shorter parallel side 20 is slightly bevwithout in any way affecting the walls or bore of eled (Figure 2) for a purpose appearing later. the drilled aperture. The non-parallel sides 2| and 22 of this blade Other objects and advantages of this invention 25 element converge toward side 20 so that up will be pointed out in the following description. contact with the work being drilled the blade The invention is illustrated in the accompanyinclination will tend to depress or cam the eleing drawings, in which: ment l4 into the slot 13 against the resistance Figure l is a general assembly view of the imof the resilient arm l5. Each of the sides 21 proved drill and deburring attachment, and 22 is suitably beveled (Figure 3) and con- Figure 2 is a transverse sectional detail at stitutes a somewhat dulled cutting edge for limline 2-2 of Figure l, iting the depth of cut when the blade is in proper Figure 3 is a detail section of the deburrlng position for removing the sharp projections or blade taken at line 3-3 of Figure 1, burrs raised by the drill. A land [31) on the lip Figure 4 is a fragmentary sectional view of the 35 ma in f e blade slot is Provided for tool in operation wherein the drill has passed eli f (Fi ur as is will und rst d. through the work and the deburringblade has Referring to Figures 4, 5 and 6 for an underremoved the burrs on the face side of the drilled standing of the operation of this deburring tool, aperture, it will be observed in Figure 4 that as the drill l0 Figure 5 is a view similar to Figure 4 but with is advanced through th k pe in the the drill advanced farther into the work to show direction of the arrow, th deburling edge 2| 0f the deburring blade retracted sufficiently to pass the element l4 contacts the facing margin of the through the bore of the aperture, aperture or bore formed by the drill and due to Figure 6 is a still more advanced view of the its edged character will cut into and remove the drill and deburring tool than that of Figure 5 u r t us producing a fi d a d sm th fa e showing its action for removing the burrs at the or marginal zone. As the drill bit advances into rear marginal surface of the work, and the work piece the inclined cutting edge 2| will Figures '7 and 8 are details of a modified form cause the blade M to be biased or cammed radiof the present invention, Figure 8 being a transsally inwardly until the side 20 clears the bore of verse section at line 8-8 of Figure 7. the drilled aperture. The resilient character of The first form of this invention comprises a arm l5 obviously will cause the blade surface 20 standard type of twist drill or drill bit l0 having to rub on the side wall of this aperture but no spiral or fluted cutting edges ll formed at one damage will occur since the bevel face thereof end and also a shank portion l2. The bit is will cause the blade to glide over the side wall adapted to be rotated by a power head not shown. without cutting. A study of Figure 2 will make this obvious, since the direction of rotation of the drill bit (see the arrow) is such as to present the beveled face to the wall of the bore.

Still further progress of the drill into and through the work will eventually carry the deburring blade element i4 suihciently forward to allow it to spring outwardly on the opposite side as in Figure 6 whereupon the trailing inclined cutting edge-22 will be or withdrawal of the bit to cut into and remove the burrs and sharp projections on the under side of the work. However, the outward force. exerted by the resilient arm portions of the aperture of all sharp-edges, burrs, and the like which form during the drill operation. In no case must the biasing force .of resilient arm press the blade l-against the work in position upon retraction.

I 5 upon the blade ele- V ment I4 is just sumcient to -clear--thema -rginal to cause either of the cutting edges 2| or22 to enter the parent material. The angle of inclinationof each of the cutting-edges 2| and 22 must also be chosen so that excessive cutting will not occur.

Another and equally useful form of the present invention hasbeen illustrated in Figures? and 8. Here the drill bit is provided with acentral longitudinal slot. 3| -to receive a deburring blade element 32 on which cutting edges-33 and 34 are formed. This blade element is identical with the previously described blade [4. However, in thismodified arrangement the blade element 32 iscarriedon or is integrally formed with a resile ient arm 35 which is detachably carried in the drill body as by positioning a lateral or inturned projectiontfi formed at thebase of this arm in a transverse aperture 3'! in; the drill shank. The armportion 38 adjacentthe lateral projectionor bent part 36 is positioned ina channel- 39; whereupon a collar 40 may beslidover the base of. arm; 35; tolock the samein place. Collar 40' is illustrated in retracted positionin dotted oute lineand in its locking positionin fullrlinejn Figure 7; When moved into locking. position, the collanabuts a: proiectingannular fiangefil ;in tegrally-formed with the drill shank. Further, this flange acts as a stop; member to limitcthe inward penetration of understood.

the drill as will be clearly--;

ment ofthe toolninto the bore to rem burrs Theresilientarm 35gis characteristically sim-v V ilar to arm [5. and-functions in a like manner tobiasthecuttingor deburring blade intoits .operr, ativeposition as has been -,po intednout in .con: nection with the previously described, embodiment of this invention shown in- Flgureli Moreover, the deburring blade elements have cutting.

edges which, because'of their'outwardlyrconverging, angular or, inclined relation, are effective. to remove burrs from the face and reverse sides of theapertureand at the sametime act as cam,- ming means whereby the blademay be completely retracted or moved intothe slot in order topermit passage thereof through the bore of the drilled opening. The double acting nature of this deburring blade'is,

in a tool of the present type.

Due to, the rotary nature of the twist. drillora bit IE] it is also, necessary to prevent excessive, movement of the bladeelement as by outward centrifugal force developedduring use of vthe tool. The arm member 35, even though resilient or flexible to permit blade movement inwardly of the slot, is also made sufliciently rigid or stiff; and ;exce ssive; outward,

to precludeundesirable movement thereof.

What is claimed is:

also of great advantage,

1. A tool for removing burrs from the face and reverse margins of a drilled bore comprising a body having a slot formed therein, a burr removing blade element positioned in said slot, and means for supporting and biasing said blade element including an arm member secured at one end in said slot and carrying said blade at its opposite end for swinging movement from a position projectinglfrom thetslot for effective conclinedg cuttingedges; one cutting edge being effective upon'radvancement of the tool into the bore .to remove burrs on the face margin while simultaneously forcing said blade to swing to retractedtposition for allowing the blade to pass through the bore, and the opposed cutting edge being effectiveupon withdrawal of the tool from the bole to remove burrs on the reverse margin rying. said blade at its opposite end for swinging movement from a position projectingfrom the slot-for effective contact with the bore margins to a retracted position within theslot to permit passage of. theblade through, the bore, saidresilient arm member biasing. the. blade to said projecting position, said blade-element having opposed and oppositely inclined 7 cutting, edges, onecutting. edge being effective upon advanceon the facegmargin while? simultaneously forcing. saidblade to ,swingtoretracted position to enable passage of the blade through the bore, and the opposed cutting, edge being effective upon withdrawal of the tool from the bore toremove burrs on the reverse-margin while-simultaneously forcing said blade to swing to retracted position for. return-passagethrough the bore;

3. In a tool for removing burrs from the face and reverse margins of a: drilled-bore, a--cylindrical body having an elongated slot ,formed therein, onelend portionof saidzslot opening through said body,- a;blade..elementipositioned in said open slot. portion, s and -a-,resilient blade supporting. armsecured at ioneof its ends insaid 1 a position normally projecting outwardlyofsaid open slotportion to a temporary positionopen slot portion to permit passage of theblade through the bore,said:resilientarm biasingthe blade to said projecting position; said blade-element having opposed-and oppositely inclined cutting edges, onecuttingedge beingeffectiveuponretracted Within said bladeito. swing to retracted. .positionfor -ret;urnzpassage through :the bore.:

4. A deburring tool comprising a body adapted to be rotated and moved axially within a bore in a workpiece, said body having a recess a resilient arm aflixed at one end thereof to the body, a blade mounted on the opposite end of said arm, the blade being supported by the arm to normally project beyond the confines of said body and being movable to a retracted position in the body recess upon fiexure of the arm, the blade having oppositely inclined edge portions for effecting movement of the blade to such retracted position by cam action with the workpiece during axial movement of the body to pass the blade through the bore in either direction.

5. A deburring tool comprising a body provided and moved axially within a bore in a workpiece, a blade having a resilient arm integral therewith and at the end thereof opposite to the blade being affixed to the body, the arm engaging said body and supporting the blade upon the body to normally project radially beyond the confines of the with a recess and adapted to be rotated 15 body and to retract within the body recess upon fiexure of the arm, the blade having oppositely inclined edge portions for effecting movement of the blade to such retracted position by cam action with the workpiece during axial movement of the body to pass the blade through the bore in either direction.

DEDGER JONES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

